Building an effiecient spl box

i need some Tips on building an efficient spl box i know my current box isnt efficient enough although i have hit a 147.8 on a TL it doesnt satisfy me im lookin at 150 like no other its been almost a year since i have set out on 150 and no go so now im asking for help.

Re: Building an effiecient spl box

i have a nissan xterra.
i peak at around 46 hz (resonant freq.)
i have played with alot of ports lol
like you cant imagine ive tryed 4" ports 6" ports and 1 8" port
didnt see much improvement
where i did see improvement is when i started makin slot ported boxes with as much port area as i could throw at it, my problem is knowing where to tune its just a pain in a$$ not havin a TL
b/c its a guessing game. i know i can pull a 150 if i get the box right which i cant seem to do.

Re: Building an effiecient spl box

here is my current design the specifications of this box will be as follows:
8 cubes net
tuned to 40 hz
165 inches of port area
corners will be 45degs (taken into account so 8 net is correct)
also the box will be resined

lets see some input guys took me a bit to draw up these plans.....
the one with the sub cut out is the top view and the port view is the front view.

Re: Building an effiecient spl box

Originally Posted by drivingreckless

here is my current design the specifications of this box will be as follows:
8 cubes netFOR 2 SUBS GOOD 1 SUB IFFY...IF U HAVE 1 SUBS TRY HALF THAT
tuned to 40 hzTUNE LOWER ...TRY 35HZ
165 inches of port areaTO BIG, IF ITS 1 SUB IN 8CUBES WITH THAT BIG OF A PORT THE SUB COULD THINK ITS IN A FREE AIR SITUATION
corners will be 45degs (taken into account so 8 net is correct)
also the box will be resinedF.UCK RESIN...OIL BASED ENAMEL PAINT FTW!!

ok in the bold part is wat u need to do and it will improve your number

Re: Building an effiecient spl box

you see i was thinking the same thing, but after alot of research into previous posts on termpro i found that almost everytime the 9515s were mentioned with spl they reccomended boxes with net cubes of 7-10, also most of them reccomended cone area = to port area, also i took into account my resonant frequency i peak at 46 hz so decided 6 hz below would do me some justice.
Apparently 9515s like big boxes with a big port. some say its an efficient box for the subwoofer, they also thru out numbers that surprised me so i had to throw this idea out.